Improvement in machinery for stretching leather belting



Y :.BRADY. v MACHINERY FOR STRETCHING LEA'I'H.. 1=..'I2. BELTING. No. 1e1-,9zo.j mme@ mei-2,

ing permanently stretches almost wholly in iibers of its texture over one another, and

STATES PATENT OFFICE'.

JAMES BRADY.` `OF BROOKLYN, NEW YORK.

IMPRQVEMENT iNMAcHlNl-:Rrv FOR sTRETcHlNG LEATHERBELTING.

Specificat.`..rformng part ,of Letters Patent No. 191,920, dated June 12, 1877; application iled May 2,

To all whom it may concern:

Be it known that I, JAMES BRADY, of Brooklyn, in the county of Kings and State of New York, have invented an Improved Machine for Stretching Leather Beltng 5 and I hereby declare that thefollowing is a full, clear, and exact description of the same, reference vbeing had to the accompanying drawing, forming part of this spebification.

My invention supplies a much-desired means for permanently stretchin g leather belting, before using the same, in a much more thorough and uniform manner than has yet been accomplished.

When leatherbelting is stretched by longitudinal stress, in any apparatus for generating such stress, by pulling in opposite directions upon the ends of the belting, the beltits weaker parts, and the stronger parts, when the belt is subsequently used on pulleys, stretch still further, and the belt becomes slack. A In searching for the cause of such stretching on the pulleys, which takes place notwithstanding the longitudinal strain of the belt on the pulleys may be less than the belt has been subjected to in the previous stretching process, l have found that the stretching on the pulleys is caused principally by the alternate bending and straightening successively of all partsof the belts, respectively, at points which come in contact with and leave the surface of the pulleys when the belt is running. This alternate bending and straightening of the belt in its various parts acts to force the therefore acts to stretch the stronger parts of the belt as well as the weaker.

My invention applies the principle of ilexion and reflexion in opposite directions to the stretching of belting before its use on pulleys to impel machinery, and it so uniformly and permanently stretches the belting in all its parts that when appliedtgpermanent usevthe belts do not stretch nor becbmeslack".

rlhe invention consists in novel mechanism for effecting the stretching of belting by alternate iiexion and reexion while said belting is put under longitudinal tension, as hereinafter described.

Figure 1 in the accompanying drawing is a top view of al machine for stretching belting constructed in accordance with my'invention. Fig. 2 is a vertical section of the same on the line x in Fig. 1.

A is the frame of the machine, at opposit ends of which are, respectively, placed a delivery-roll, B, and a receiving-roll, B', the belting D to be stretched being wound first upon said delivery-roll, and afterward wound oi' from said delivery-roll and onto said receiving-roll during the process of stretching said belting. V

Between said rolls are arranged in fixed bearings the flexion and rellexion rollers E. Other adjustable flexion and redexion rollers, E', are also arranged in adjustable bearings in the frame A.

' The delivery-roll B and the receiving-roll B are each provided with a fixed llange or head, C, and an adjustable flange or head, C', which confine the belt laterally' when undergoing the stretching process, and keep itl straight, the adjustable ange G' being provided `with a set-screwor other means for holding it in position.

Means for attaching the ends of the belting, respectively, to said delivery and receiving rolls are also provided, a groove, g, in Vwhich the end ofthe belt is inserted and clamped by `wedging or otherwise, being advantageously employed for this purpose.

The said liexion and reflexion rollers E and E are placed in parallel relation with each other and the rolls B and B' 5 but I do not limit myself to any particular number or position of said rollers between the rolls B and B.

oli' from the said delivery-roll. But the brake may be otherwise constructed and applied to give the required constant tension to the beltmg.

The adjustability of the flexion and reflexion rolls E' adapts the machine to stretching long or short belts.

The beltingD to be stretched is .iirst lattached to and Wound upon the delivery-roll B, and the brake F is applied thereto. rlhe free end of the belting is then passed alternately over the several lexion and reflexion 'turning of the said receivingvroll, to wind the belting upon said roll and unwind it from the delivery-roll. In passing from the deliveryroll to the receiving-roll all parts of the belting are subjected to alternate and repeated flexion and reflexion While under longitudinal strain, and the thorough permanent stretching of the thicker as well as the thinner parts of the belting yis e'ected.

I claim- The combination of the deliveryroll VB, the receiving-roll B', the flexion and reflexion rollers E E', and the brake F, substantially as and for''the purpose described.

JAMES BRADY.

Witnesses:

FRED. HAYNEs, EDWARD B. SPERRY. 

